When you are smoking weed outside, preferably under a tree, and you are at one with nature, and you realize you are there you exclaim, I am "High like an Indian."

AK and Alex were smoking WEED under the tree and alex looked up at the tree. HE was so high that he thought he was sitting under a peice of broccoli. He then came to the conclusion that the Indians believed there spirits were in trees, and he felt at one with nature, and said to AK, "I am HIGH like an Indian."